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TM5-4120-387-14
Figure 4-54. Heater Cutout (Thermostat) Switch (S3)
Voltages used can kill.
Always disconnect power cord to air
conditioner before performing any internal maintenance.
Shutting unit off at its control panel does not disconnect
unit power.
a.
Removal
(1) Tag and disconnect wire leads.
(2) Disconnect connector J7.
(3) Using screwdriver and wrench,
remove two screws and locknuts in
thermostat.
(4) Remove heater cutout (thermostat) switch.
b.
Test.
With thermostat at room temperature, use a multimeter set on the
lowest OHMS scale to check for continuity between each pair of contacts (4 and 6,
4 and 5, and 5 and 6).
If continuity is not indicated between all contacts,
replace the thermostat.
4-134
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